Abstract
Role of pairing correlations unique in low-frequency vibrational excitations of neutron drip line nuclei is discussed. Self-consistent pairing correlations in Hartree–Fock–Bogoliubov (HFB) theory cause the change of the spatial structure of the quasiparticle wave functions; the pairing anti-halo effect in the lower component and the broadening effect in the upper component. By performing HFB plus quasiparticle random phase approximation (QRPA) calculation for the isoscalar quadrupole response in 86Ni, we discuss the role of self-consistent pairing correlations for emergency of low-frequency vibrational excitations in neutron drip line nuclei paying special attention to neutrons with small orbital angular momentum ℓ.
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